What group of letters comes next in this series?

What group of letters comes next in this series? What would be the next group of letters in this series?aaaa. what number comes next in the following series? What number comes next in following series 9,12,21,48 奥英难题,1.What number comes next in the following series?9,12,2 What number comes next in this sequence:_______________ 9174 what would be the next number in this series"2...4...8...16. which number should come next in this series? 一道找规律题的解法What is the next term in this series?100 121 144 20 一道英语的智力题求解What would be the next number in this series?0,5,1 Which letter comes next in the series?S,M,H,D,W,M,__________ Write the letter that comes next in the series:a,c,e,g,翻译